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Analog Devices Inc./Maxim Integrated MAX197AENI
- Part No.:
- MAX197AENI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX197AENI.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,889
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Product details
Overview
MAX197AENI from Maxim Integrated is a 12-bit, multi-range data-acquisition system (DAS) with 8 analog input channels, single +5V supply operation, ±16.5V fault-tolerant inputs, and software-selectable ranges (±10V, ±5V, 0V to +10V, 0V to +5V). It delivers 100ksps throughput, 6µs conversion time, and internal/external clock & acquisition control - enabling direct interfacing of industrial 4mA–20mA, ±12V, and ±15V sensors to low-voltage embedded systems.
For engineers reviewing the MAX197AENI datasheet, MAX197AENI pinout, MAX197AENI application, or MAX197AENI equivalent, this device serves as a high-precision, rail-to-rail tolerant ADC for industrial control, automated test equipment, and medical instrumentation where signal integrity across wide voltage ranges and power-down flexibility are critical selection criteria.
Technical Context
The MAX197AENI employs a successive-approximation register (SAR) architecture with integrated track/hold (5MHz small-signal bandwidth), supporting both internal (capacitor-timed) and external acquisition control modes. Its 8+4 parallel bus interface uses HBEN to multiplex 12-bit output across two 8-bit reads (LSBs first, then MSBs).
It features dual power-down modes: STBYPD retains reference buffer operation for fast wake-up (<8ms settling), while FULLPD disables all analog circuitry including the bandgap reference. Input protection remains active in all modes, with ±16.5V overvoltage tolerance independent of VDD status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with ±1/2 LSB INL and ±1 LSB DNL - ensures monotonicity and accurate full-scale transitions in precision measurement. |
| Input Ranges | Software-selectable: ±10V, ±5V, 0V to +10V, 0V to +5V - enables single-supply system compatibility with bipolar and unipolar field sensors without external level-shifting. |
| Throughput Rate | 100ksps maximum - supports real-time sampling of signals up to ~5kHz fundamental frequency with adequate Nyquist margin. |
| Conversion Time | 6µs - fixed 12-clock-cycle conversion period, compatible with internal (1.56MHz typical) or external (100kHz–2MHz) clock sources. |
| Reference Options | Internal 4.096V (±1.5% adjustable) or external reference at REF/REFADJ - provides flexibility for accuracy-critical applications requiring traceable voltage standards. |
| Fault Tolerance | ±16.5V input overvoltage protection on all CH0–CH7 - prevents damage or corruption during sensor disconnect, wiring faults, or transient coupling in industrial environments. |
| Power-Down Modes | STBYPD (reference buffer active, <8ms wake-up) and FULLPD (full analog shutdown, µA-level current) - enables dynamic power management in battery- or thermally constrained systems. |
Pinout & Package
MAX197AENI is packaged in a 28-pin narrow-body plastic DIP (Dual In-line Package) with 0.3-inch width, lead pitch of 0.1 inch, and through-hole mounting. Pin 1 is marked by a notch or dot; top-side marking includes "MAX197AENI" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 16–23) | Analog input channel terminals | Eight independently selectable single-ended inputs; each protected to ±16.5V and configurable for any supported range via control byte. |
| REF (Pin 26) | Reference buffer output / external reference input | Provides 4.096V nominal internal reference; accepts external reference when REFADJ is tied to VDD - sets full-scale scaling for all conversions. |
| REFADJ (Pin 25) | Reference adjust input / buffer gain control | Accepts 2.4V–4.18V external reference; internal gain of 1.6384 yields 4.096V at REF - enables precise trimming and low-noise external reference integration. |
| HBEN (Pin 5) | High-byte enable control | When high, outputs upper 4 bits (B8–B11) on D0–D3; when low, outputs lower 8 bits (B0–B7) - implements 8+4 bus interface to conserve microprocessor data bus width. |
| SHDN (Pin 6) | Hardware shutdown input | Active-low signal forcing immediate FULLPD mode - aborts ongoing conversion and reduces supply current to <10µA within microseconds. |
| INT (Pin 24) | Interrupt output | Open-drain, active-low flag signaling conversion completion and data readiness - synchronizes µP read cycles without polling overhead. |
| WR / RD / CS (Pins 3, 4, 2) | Digital control interface | Standard 8080-style parallel bus timing - WR latches configuration/control byte; RD reads conversion result; CS enables interface access. |
| D0/D8–D3/D11 (Pins 14, 13, 12, 11) | Multiplexed data I/O | Three-state bidirectional pins carrying LSBs (HBEN = low) or MSBs (HBEN = high) - eliminates need for separate 12-bit data bus or glue logic. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-range input programming | Single control byte selects ±10V, ±5V, 0–10V, or 0–5V range per channel - eliminates external gain-switching circuitry and simplifies BOM for mixed-sensor systems. |
| Fault-protected analog mux | ±16.5V tolerance on all eight inputs with no impact on selected channel's conversion - maintains measurement integrity during channel switching or fault events. |
| Internal track/hold with 5MHz bandwidth | Enables accurate digitization of signals with fast edges or high-frequency content up to 5MHz - reduces need for external anti-alias filtering in many applications. |
| Two-stage power-down (STBYPD/FULLPD) | STBYPD preserves reference stability for sub-10ms wake-up; FULLPD cuts current to µA level - supports adaptive sampling strategies in energy-sensitive designs. |
| 8+4 parallel interface | 12-bit result delivered across two 8-bit µP bus cycles using HBEN - avoids 16-bit bus requirement and simplifies integration with 8-bit microcontrollers. |
Applications
| Industrial Control Systems | Automatic Testing Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow transmitters in PLC-based factory automation cabinets with mixed 4–20mA, ±10V, and 0–5V sensor outputs. IC Role / Device Role / Timing Role: Central 12-bit ADC acquiring synchronized samples from 8 analog field inputs under µP control, with programmable range per channel and fault immunity. Use Value: Eliminates external signal conditioning per channel, reduces PCB area by 30%, and prevents system lockup during sensor short-circuit events. | Use Scenario: High-speed functional testing of analog front-ends in production line test fixtures for power supplies and motor drives. IC Role / Device Role / Timing Role: Precision DAS capturing transient waveforms (e.g., startup surges, fault responses) at 100ksps with deterministic timing via external acquisition control. Use Value: Enables repeatable 6µs aperture timing and ±1/2 LSB linearity verification without external T/H or clock generators. |
| Medical Instruments | Robotics |
Use Scenario: Biopotential signal acquisition (ECG, EMG) in portable diagnostic devices requiring low-power operation and DC-coupled input capability. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail tolerant ADC converting differential sensor outputs with ±5V range and internal reference stability. Use Value: Achieves >10.5 ENOB at 1kHz while consuming only 18mA in normal mode - extends battery life without sacrificing diagnostic resolution. | Use Scenario: Joint torque and position feedback acquisition in collaborative robot arms interfacing strain gauges, potentiometers, and Hall-effect sensors. IC Role / Device Role / Timing Role: Multi-range DAS sampling mixed-output sensors (0–10V encoders, ±10V load cells) with simultaneous channel scanning and interrupt-driven data transfer. Use Value: Reduces sensor interface latency by 40% versus discrete op-amp + ADC solutions and enables real-time closed-loop control at 1kHz update rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multi-range data-acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX197BCNI | Same pinout and functionality; wider operating temperature range (0°C to +70°C vs. -40°C to +85°C for MAX197AENI) and tighter gain error spec (±7 LSB vs. ±10 LSB). | Preferred for commercial-grade industrial controllers where extended temp range is not required but higher DC accuracy is critical. | Select MAX197BCNI when absolute gain error <±7 LSB is mandatory and ambient temperature stays within 0°C–70°C. |
| ADS8556IPM | 16-bit resolution, 680ksps, SPI interface, ±10V/±5V ranges, but requires ±5V dual supply and lacks ±16.5V fault tolerance. | Suitable for high-resolution lab equipment where speed and resolution outweigh ruggedness and single-supply simplicity. | Choose ADS8556IPM only if 16-bit ENOB and SPI compatibility justify added supply complexity and reduced fault resilience. |
Compared with MAX197BCNI and ADS8556IPM, the MAX197AENI uniquely balances single +5V operation, ±16.5V input protection, and 12-bit precision - making it optimal for cost-sensitive, field-deployed systems requiring robustness without sacrificing measurement fidelity.
Availability
MAX197AENI is available at Aetrix Electronics and suitable for industrial control systems, automatic test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX197AENI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX197 product line delivers integrated data-acquisition systems with multi-range inputs, fault protection, and µP-friendly interfaces - targeting applications where sensor diversity, ruggedness, and single-supply simplicity are essential.
FAQ
What is the operating temperature range for the MAX197AENI?
The MAX197AENI is rated for operation from -40°C to +85°C. This extended industrial temperature range ensures reliable performance in harsh environments such as factory floors, outdoor instrumentation, and vehicle-mounted test systems - unlike the commercial-grade MAX197ACNI (0°C to +70°C) or MAX197BCNI variants.
Does the MAX197AENI require an external reference, or does it include an internal one?
The MAX197AENI includes an internal 4.096V reference with ±1.5% adjustability via REFADJ, eliminating the need for external references in most applications. However, it also supports external references applied at REF or REFADJ - enabling higher accuracy when traceable standards or ultra-low-noise sources are required. The internal reference remains active in STBYPD mode.
How does the 8+4 bus interface of the MAX197AENI work with standard 8-bit microprocessors?
The MAX197AENI uses HBEN to multiplex its 12-bit result across two 8-bit reads: when HBEN is low, D0–D7 carry the LSBs (B0–B7); when HBEN is high, D0–D3 carry the MSBs (B8–B11), and D4–D7 reflect sign extension (bipolar) or zero-fill (unipolar). This allows seamless connection to 8-bit µPs without address/data demultiplexing or additional latches.
Can the MAX197AENI safely interface with ±15V sensors while powered only by +5V?
Yes - the MAX197AENI's analog inputs are fault-protected to ±16.5V, allowing direct connection of ±12V and ±15V powered sensors even with VDD = +5V. Input current is limited to ±720µA across the full ±16.5V range, and channel-to-channel crosstalk remains ≤-86dB, ensuring unaffected conversion accuracy on the selected channel during overvoltage events.
What are the key differences between STBYPD and FULLPD power-down modes in the MAX197AENI?
In STBYPD mode, the reference buffer remains active, maintaining the 4.7µF capacitor voltage at REF for fast wake-up (<8ms), while digital interface stays responsive. FULLPD disables the bandgap reference, T/H, and ADC core, reducing supply current to <10µA but requiring full reference settling (~8ms) before valid conversions resume. Hardware SHDN forces immediate FULLPD regardless of software state.
MAX197AENI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX197AENI FAQ
1.How can I place an order for MAX197AENI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX197AENI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX197AENI reliable?
The price and inventory of MAX197AENI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX197AENI is usually 5 days.
3.What payment methods are accepted for MAX197AENI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX197AENI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX197AENI?
MAX197AENI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX197AENI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX197AENI?
For technical support, including MAX197AENI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX197AENI requirements.
6.How does Aetrix verify that MAX197AENI is sourced from the original manufacturer or authorized distributors?
All MAX197AENI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX197AENI meets industry standards.
7.What is the process for return or replacement of MAX197AENI?
All MAX197AENI units undergo pre-shipment inspection (PSI). If there is an issue with MAX197AENI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX197AENI part is unused and in its original packaging.
Return procedure for MAX197AENI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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